KR20120032214A - Fluid dynamic bearing assembly - Google Patents

Fluid dynamic bearing assembly Download PDF

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Publication number
KR20120032214A
KR20120032214A KR1020100093736A KR20100093736A KR20120032214A KR 20120032214 A KR20120032214 A KR 20120032214A KR 1020100093736 A KR1020100093736 A KR 1020100093736A KR 20100093736 A KR20100093736 A KR 20100093736A KR 20120032214 A KR20120032214 A KR 20120032214A
Authority
KR
South Korea
Prior art keywords
shaft
thrust plate
bearing assembly
sleeve
adhesive
Prior art date
Application number
KR1020100093736A
Other languages
Korean (ko)
Inventor
김주환
Original Assignee
삼성전기주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성전기주식회사 filed Critical 삼성전기주식회사
Priority to KR1020100093736A priority Critical patent/KR20120032214A/en
Publication of KR20120032214A publication Critical patent/KR20120032214A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • F16C17/045—Sliding-contact bearings for exclusively rotary movement for axial load only with grooves in the bearing surface to generate hydrodynamic pressure, e.g. spiral groove thrust bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G11B19/2036—Motors characterized by fluid-dynamic bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Power Engineering (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

PURPOSE: A hydrodynamic bearing assembly is provided to reduce contamination of a thrust plate caused by an adhesive because the adhesive fills a space between a shaft and thrust plate. CONSTITUTION: A hydrodynamic bearing assembly(100) comprises a sleeve(120) and a thrust plate(130). The sleeve supports a shaft(110). The thrust plate is mounted to the shaft to be arranged at least one side of the upper and lower parts of the sleeve. A space between the shaft and thrust late is filled with an adhesive while mounting the thrust plate in the shaft. A chamfer is formed in the inner circumference of the thrust plate so that a binding capacity between the thrust plate and shaft is enhanced.

Description

Fluid Dynamic Bearing Assembly {FLUID DYNAMIC BEARING ASSEMBLY}

The present invention relates to a fluid dynamic bearing assembly, and more particularly to a fluid dynamic bearing assembly that is provided in the motor to form a dynamic pressure.

Small spindle motors typically used in hard disk drives (HDDs) are equipped with a hydrodynamic bearing assembly and provide oil-like lubrication to the bearing clearances formed between the shaft and sleeve of the hydrodynamic bearing assembly. The fluid is filled. The oil filled in the bearing gap is compressed to form a fluid dynamic pressure to rotatably support the shaft.

On the other hand, the fluid dynamic bearing assembly is provided with a thrust plate for generating an axial dynamic pressure, the thrust plate is fixed to the shaft. That is, the thrust plate is fixedly fixed to the shaft through an adhesive.

However, when the adhesive is filled in the space formed by the thrust plate and the shaft to fix the thrust plate and the shaft, there is a problem that the filled adhesive flows out to the bottom surface of the thrust plate and contaminates the bottom surface of the thrust plate.

Accordingly, the amount of filling of the adhesive is reduced in order not to contaminate the bottom surface of the thrust plate.

Accordingly, there is a problem that the coupling force of the thrust plate and the shaft, that is, the extraction force of the thrust plate is reduced.

It is an object of the present invention to provide a fluid dynamic bearing assembly which can increase the coupling force between the thrust plate and the shaft and at the same time not contaminate the bottom of the thrust plate.

The hydrodynamic bearing assembly according to the present invention is mounted on the shaft so as to be disposed on at least one side of the sleeve and the upper and lower portions of the sleeve, and the adhesive is accommodated in the space between the shaft when the shaft is mounted on the shaft. It includes a thrust plate formed with a chamfer on the inner peripheral surface to increase the coupling force with the shaft.

The shaft may have a stepped portion to form a closed space with a chamfer formed in the thrust plate.

The thrust plate may be formed with a dynamic pressure groove to form a dynamic pressure on the bottom surface.

The dynamic pressure groove may be formed on a bottom surface of the thrust plate disposed between the circulation holes formed in the sleeve from the end of the chamfer.

The dynamic pressure groove may have any one of a spiral shape or a herringbone shape.

The thrust plate may be formed on any one of the upper surface or the bottom surface is formed on any one of the upper surface or the bottom surface of the thrust plate may be formed with an identification display for guiding the direction in which the thrust plate is mounted on the shaft.

According to the present invention, by forming the filling space of the adhesive between the shaft and the thrust plate through the chamfer can be coupled to the shaft and the thrust plate by the filled adhesive has the effect of increasing the coupling force of the thrust plate and the shaft. .

In addition, since the filling space is accommodated between the shaft and the thrust plate, the adhesive to be filled has an effect of reducing contamination of the thrust plate by the filling adhesive.

And thrust fluid dynamic pressure can be formed through the dynamic pressure groove formed in the thrust plate.

In addition, there is an effect that allows the operator to more easily recognize the coupling direction of the thrust plate when inserting the thrust plate into the shaft through the identification display.

1 is a schematic cross-sectional view showing a motor having a fluid dynamic bearing assembly according to an embodiment of the present invention.
FIG. 2 is an enlarged view illustrating a portion 'A' of FIG. 1.
Figure 3 is a bottom view showing the bottom of the thrust plate according to an embodiment of the present invention.
4 is a plan view showing an upper surface of a thrust plate according to an embodiment of the present invention.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments which fall within the scope of the inventive concept may be easily suggested, but are also included within the scope of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a schematic cross-sectional view showing a motor having a hydrodynamic bearing assembly according to an embodiment of the present invention, FIG. 2 is an enlarged view showing part 'A' of FIG. 1, and FIG. 3 is an embodiment of the present invention. 4 is a bottom view illustrating a bottom surface of a thrust plate, and FIG. 4 is a plan view illustrating a top surface of a thrust plate according to an embodiment of the present invention.

1 to 4, a hydrodynamic bearing assembly 100 according to an embodiment of the present invention includes a shaft 110, a sleeve 120, and a thrust plate 130.

On the other hand, the motor 10, in which the fluid dynamic bearing assembly 100 is installed, is a motor applied to a recording disk drive device for rotating a recording disk, and includes a rotor 20 and a stator 40.

The rotor 20 is provided with the cup-shaped rotor case 25 which equips the outer peripheral part with the annular magnet 26 corresponding to the stator core 42. As shown in FIG. The ring-shaped magnet 26 is a permanent magnet in which the N pole and the S pole are alternately magnetized in the circumferential direction to generate a magnetic force of a constant intensity.

In addition, the rotor case 25 may include a rotor hub 25a inserted into the shaft 110 and a magnet coupling portion 25b for disposing the annular magnet 26 on the inner surface thereof.

The stator 40 means all fixed members except the rotating member, and includes a stator core 42 and a winding coil 44 surrounding the stator core 42.

On the other hand, the magnet 26 provided on the inner circumferential surface of the magnet coupling portion 25b is disposed to face the winding coil 44, the rotor 20 by the electromagnetic interaction of the magnet 26 and the winding coil 44 Will rotate. In other words, when the rotor case 25 rotates, the shaft 110 interlocking with the rotor case 25 rotates.

First, when defining the term for the direction here, the axial direction refers to the up and down direction relative to the shaft 110, as shown in Figure 1, the radial direction is the outer end of the rotor 20 relative to the shaft 110 It means the direction of the center of the shaft 110 on the basis of the direction or the outer end of the rotor 20, and means the direction in which the circumferential direction is rotated along the outer peripheral surface of the shaft (110).

The shaft 110 is inserted into the sleeve 120 is installed. In addition, as shown in FIG. 2, the shaft 110 may include a stepped part 112 on which the thrust plate 130 is installed. That is, the stepped portion 112 on which the inner circumferential surface side of the thrust plate 130 formed in the annular shape is seated is formed on the shaft 110.

Detailed description of the step portion 112 will be described later.

Sleeve 120 supports shaft 110. That is, the shaft 110 is rotatably mounted to the sleeve 120, and the sleeve 120 rotatably supports the shaft 110.

Meanwhile, the sleeve 120 may be formed by forging Cu or Al, or sintering Cu-Fe-based alloy powder or SUS-based powder, and may have the same outer diameter in the axial direction. Therefore, the sleeve 120 may be manufactured in one mold.

In addition, the sleeve 120 may have a hollow cylindrical shape so that the shaft 110 can be inserted and mounted. In addition, a bearing gap is formed between the inner circumferential surface of the sleeve 120 and the shaft 110, and a lubricating fluid is filled in the bearing gap. Accordingly, the lubricating fluid filled during the rotation of the shaft 110 is compressed to form a fluid dynamic pressure to rotatably support the shaft 110.

In addition, the sleeve 120 may include a circulation hole 122 that provides a movement path of the lubricating fluid in the axial direction so that the lubricating fluid filled in the bearing gap can be circulated. That is, the lubricating fluid filled between the inner circumferential surface of the sleeve 120 and the shaft 110 may flow through the circulation hole 122 to flow counterclockwise.

The thrust plate 130 is mounted on the shaft 110 to be disposed on at least one of the upper and lower sides of the sleeve 120, and when the thrust plate 130 is mounted on the shaft 110, an adhesive is accommodated in the space between the shaft 110 and the shaft 110. The chamfer 132 is formed on the inner circumferential surface to increase the bonding force with).

That is, the thrust plate 130 in the present embodiment is mounted to the shaft 110 to be disposed above the sleeve 120. In addition, when the thrust plate 130 is mounted on the shaft 110, an adhesive is filled between the thrust plate 130 and the shaft 110, and the thrust plate 130 and the shaft 110 are fixed by the filled adhesive. Can be combined.

In addition, as shown in FIG. 2, a chamfer 132 may be formed at a lower side of the inner circumferential surface of the thrust plate 130 to fill a predetermined amount of the adhesive to be filled. In this embodiment, the case in which the chamfer 132 is formed on the lower side of the inner circumferential surface of the thrust plate 130 has been described as an example, but is not limited thereto. The chamfer 132 may be formed on the inner circumferential surface of the thrust plate 130. It may be.

On the other hand, when the chamfer 132 is provided on the thrust plate 130 and the thrust plate 130 is installed on the shaft 110, a filling space is formed between the thrust plate 130 and the shaft 110.

In more detail, as shown in FIG. 2, the stepped portion 112 is formed in the shaft 110, and the thrust plate 130 has an inner side thereof mounted on the stepped portion 112 of the shaft 110. The shaft 110 and the thrust plate 130 are fixedly coupled.

In addition, the chamfer 132 formed on the lower side of the inner circumferential surface of the thrust plate 130 is disposed to face the step portion 112 of the shaft 110. Therefore, the filling space of the adhesive is formed by the step portion 112 of the shaft 110 and the chamfer 132 of the thrust plate 130.

As a result, the shaft 110 and the thrust plate 130 may be coupled by the adhesive filled in the filling space formed by the stepped portion 112 and the chamfer 132 so that the shaft 110 and the thrust plate 130 may be combined. The binding force of can be increased.

In addition, since the adhesive is filled in the filling space formed by the stepped portion 112 and the chamfer 132, the contamination caused by the adhesive applied to the bottom surface of the thrust plate 130 may be reduced.

Meanwhile, as shown in FIG. 3, the thrust plate 130 may have a dynamic pressure groove 134 for forming dynamic pressure on a bottom surface thereof. The dynamic pressure groove 134 of the thrust plate 130 is disposed between the circulation holes 122 formed in the sleeve 120 from the end of the chamfer 132 when the thrust plate 130 is mounted to the shaft 110. It may be formed on the bottom.

Accordingly, the thrust dynamic pressure generated when the shaft 110 rotates may be increased.

That is, conventionally, the dynamic groove 134 is not formed on the bottom surface of the thrust plate 130, and only the thrust dynamic pressure generated by the dynamic pressure groove is formed on the opposite surface of the sleeve 120 to the thrust plate 130. It is lower than the present invention in which the dynamic groove 134 is also formed on the bottom surface of 130).

As a result, the dynamic pressure generated by forming the dynamic pressure groove 134 on the bottom surface of the thrust plate 130 may be increased.

Meanwhile, the dynamic pressure groove 134 may have any one of a spiral shape or a herringbone shape. In the present embodiment, the dynamic groove 134 has a spiral shape as an example, but may be formed in any shape capable of generating a thrust dynamic pressure when the shaft 110 rotates.

The thrust plate 130 may include an identification display unit 136 formed on one of the top and bottom surfaces to guide the direction in which the thrust plate 130 is mounted on the shaft 110.

Accordingly, when the operator mounts the thrust plate 130 to the shaft 110, the direction in which the thrust plate 130 is mounted may be more easily recognized.

On the other hand, the identification display unit 136 may be made of a recognition line coated with a fluorescent material so that the operator can easily recognize, or may be made of a recognition line coated with a fluorescent material disappears when contacted with the lubricating fluid.

As described above, by forming the filling space of the adhesive between the shaft 110 and the thrust plate 130 through the chamfer 132 can be coupled to the shaft 110 and the thrust plate 130 by the filled adhesive The coupling force between the thrust plate 130 and the shaft 110 may be increased.

In addition, a filling space is formed between the shaft 110 and the thrust plate 130 to fill the adhesive, thereby reducing contamination of the thrust plate 130 by the filling adhesive.

The thrust fluid dynamic pressure may be more easily formed through the dynamic groove 134 formed on the bottom surface of the thrust plate 130.

In addition, when the insertion coupling of the thrust plate to the shaft through the identification display unit 136, the operator can easily recognize the coupling direction of the thrust plate 130.

100: hydrodynamic bearing assembly
110: the shaft
120: sleeve
130: thrust plate

Claims (6)

A sleeve supporting the shaft; And
Thrust plate is mounted on the shaft so as to be disposed on at least one side of the upper and lower portions of the sleeve, and the chamfer is formed on the inner circumferential surface to increase the bonding force with the adhesive when the adhesive is accommodated in the space between the shaft and the attachment to the shaft ;
Fluid dynamic bearing assembly comprising a. The method of claim 1, wherein the shaft
And a stepped portion to form a chamfer and a sealed space formed in the thrust plate. The method of claim 1, wherein the thrust plate is
A fluid dynamic bearing assembly, characterized in that a dynamic pressure groove is formed on the bottom to form a dynamic pressure. The method of claim 3 wherein the dynamic groove is
And a bottom surface of the thrust plate disposed between the circulation holes formed in the sleeve from an end of the chamfer. The method of claim 4, wherein the dynamic groove
A hydrodynamic bearing assembly having a spiral shape or a herringbone shape. According to claim 1, wherein the thrust plate is
The hydrodynamic bearing assembly is formed on any one of the upper surface or the bottom surface is formed with an identification indicator for guiding the direction in which the thrust plate is mounted to the shaft.
KR1020100093736A 2010-09-28 2010-09-28 Fluid dynamic bearing assembly KR20120032214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100093736A KR20120032214A (en) 2010-09-28 2010-09-28 Fluid dynamic bearing assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100093736A KR20120032214A (en) 2010-09-28 2010-09-28 Fluid dynamic bearing assembly

Publications (1)

Publication Number Publication Date
KR20120032214A true KR20120032214A (en) 2012-04-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100093736A KR20120032214A (en) 2010-09-28 2010-09-28 Fluid dynamic bearing assembly

Country Status (1)

Country Link
KR (1) KR20120032214A (en)

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